Effective Labeled Time Slots Based D2D Transmission in Cellular Downlink Spectrums

A hybrid system consisting of a cellular network and a device-to-device (D2D) network is considered in this paper where the D2D users operate in an underlay mode and reuse the spectrums with the cellular users. Most researches focus on reusing the uplink spectrums but how to share the downlink frequency bands is seldom addressed. To share the downlink spectrums and avoid the interference to the primary cellular devices, a labeled time slots based mechanism is proposed and the implementation details are described in a real cellular system. Simulation results prove that satisfying performance can be achieved by using the proposed mechanism.